Three men, Atkins, Brown, and Cranby, had to go a journey of forty miles. Atkins could
walk one mile an hour, Brown could walk two miles an hour, and Cranby could go in his donkey cart at eight miles an hour.
They start at the same time. Cranby drove Atkins a
certain distance, and dropping him to walk the remainder, drove back to meet
Brown on the way and carried him to their destination, where they all arrived
at the same time. How long did the journey take? Of course each went at a
uniform rate throughout.